Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cc447748320ee3…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 03:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8f2bcc109721ed42048dc89dbb6e1405 SHA-1: deede423086438e2066f7887b623512c9dae54c5 SHA-256: 16cc447748320ee3d7d1311133499659dbda78c7cb4a6dd2905a118e6f8b4a8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting, specifically pointing to 'http://variwat.22web.org/35748498621.pdf'. The document body, though heavily obfuscated, suggests a lure related to a 'silent auction winner thank you letter', aiming to trick users into visiting external sites. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=silent+auction+winner+thank+you+letter PDF link annotation
    • http://variwat.22web.org/35748498621.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/wobanefasafapil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_60154e423b927.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/8af27.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/alisan_porter_the_voice_all_performances.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/jasasusejikodo.pdfIn PDF document text
    • http://vizionsmc.net/good_guides_for_class_11_cbsedfgye.pdfIn PDF document text
    • http://rovonafitapos.22web.org/sijewonedar.pdfIn PDF document text
    • http://medway24.com/oxford_comma_example_eats_shoots_and_leavesg282o.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/pewej-sozumuxopimil-bijewojojeme-jonevejuveg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fece7dabc0bd.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/zokadipodijuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fda471a16a11.pdfIn PDF document text
    • http://rewutudot.iblogger.org/fapekatupedosuzanamukas.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/gufifepabijudolovegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapadukaf.epizy.com/beowulf_burton_raffel_publication.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d29d0aa-041a-44d6-baf9-f677a98c33cb/intermatic_light_timer_ej600_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68dc9beb-f782-4a96-b80c-ab8fe4610000/mujef.pdfIn PDF document text
    • http://fuluputig.epizy.com/82943890378.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 5072 bytes
SHA-256: 57daa8ec6dc32d89b9c652caacc7537ddf700ee806329c8e31b45b09bcbfcc9c
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 10076 bytes
SHA-256: 84276b0154b126a7afd09baa3b9a3e0dbf4a5abd19c28ff3896a6ab981137d7a

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